#include<stdio.h>
int main(){
    int num=50;
    num+=20;
    printf("num = %d\n",num);
    num-=10;
     printf("num = %d\n",num);
    num*=2;
     printf("num = %d\n",num);
    num/=5;
     printf("num = %d\n",num);
    num%=7;
     printf("num = %d\n",num);


}